Neoclassical momentum transport in a collisional stellarator and a rippled tokamak
Neoclassical momentum transport in a collisional stellarator and a rippled tokamak
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碰撞仿星器和波纹托卡马克中的新古典动量传输
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
P. Helander
中科院分区：
文献类型：
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作者：
A. Simakov;P. Helander
用短平均自由路径双流体方程计算了三维环形磁场约束下等离子体中的最低阶非双极径向电流。这一结果被用来得到在这样的场中等离子体输运的内禀双极性的必要条件，并导出了环向场波纹对碰撞托卡马克等离子体旋转的重要性的判据。如果特征垂直长度尺度由极向离子回转半径的基座宽度决定(在H模区可能是这种情况)，则发现对环形等离子体旋转的波纹影响可以忽略不计，但可以想象，对于更浅的等离子体梯度，波纹效应可能变得重要。
Short mean-free path two-fluid equations are employed to evaluate the lowest order nonambipolar radial current in plasma confined by a three-dimensional toroidal magnetic field. The result is used to obtain a necessary condition for intrinsic ambipolarity of plasma transport in such a field and to derive a criterion for the importance of the toroidal field ripple for collisional tokamak plasma rotation. The ripple effects on toroidal plasma rotation are found to be negligible if the characteristic perpendicular length scale is determined by the pedestal width of order the poloidal ion gyroradius (as may be the case in the H-mode regime), but may conceivably become important for more shallow plasma gradients.